Oil-burning furnace.



J. 8. BROWN. 7 01L Bl JRNING FURNACE. APPLICATION FILED AFR-26, I915.

mmgelan Patented Mar. 7', 1916.

mev r JOHN ROBERT BROWN, OF VANCOUVER, BRITISH COLUMBIA, CANADA, ASSIGNOR OF ONE-HALF TO ALBERT STILES AND ONE-FOURTH TO ROBERT JARDINE, BOTH OF NEW WESTMINSTER, BRITISH COLUMBIA, CANADA, AND ONE-EIGHTH TO ERNEST EDWARD HALL, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

OIL-BURNING FURNACE.

To all whom it may concern:

Be it known that I, J OHN-ROBERT Brown, a subject of the King of Great Britain, and a resident of the city of Vancouver, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Oil-Burning Furnaces, of'which the following is a specification.

My invention relates to improvements in means for atomizing fuel oil, and the object of my invention is to devise a means, applicable to land or marine boilers, the use of which insures the perfect atomizing in thefurnace of the oil and thereby enables smokeless combustion and great economy of fuel consumption to be obtained."

I attain this object by the means illustrated in the accompanying drawings in which Figure 1 is a perspective View of the front end of a land boiler with side removed to show the furnace. Fig. 2 is a sectional view of the burner, the pipe arrangement being shown in a modified form. Fig. 3 is a per spective view of the grate. surface and bridge. Fig. at is a cross section of the burner on the line w z of Fig. 2. Fig. 5 is an end View of the burner tip.

Similar figures of reference indicate similar parts throughout the several views.

1 indicates the front end of a land boiler of the locomotive type, with one side partly removed to show the furnace 2, the aslipit 3, tubes at, grate bars 5, and the crown sheet 6, which crown sheet is shown dotted for the sake of clearness.

7 indicates the furnace front having the usual furnace door 8 and ashpit'damper 9, and 10 indicates a floor of firebrick laid on top of the grate bars 5, at the inner end of which flooris raised a bridge 11, also of firebrick. Air passages 12, 13 and 14 are provided in the floor l0, these'passages being in communication with the ashpit 3 so that the natural draft through the ashpit door opening may pass through without obstruction into the furnace. The total area of the passages 12, 13 and 14: is not less than the area. of the ashpit door opening, and the passages 12 are made larger than the passages 13 and 14 respectively to insure an even and proportional distribution of the natural draft-throughout the furnace,

Spr ificationof Letters Patent.

Application filed April 26, 1915.

Patented Mar. 7, 191 6.

Serial No. 24,007.

it being found that more air is required near the tip of the burner where there is more fuel than farther away where there is less fuel. These air passages 12,13 and 1% are arranged on each side of the center line of the burner, since ifthey were directly underneath the flame .the draft would drive the gases straight through the tubes whereas by arranging them as shown in Figs. 1 and 3, the air mixes more readily with the gases and more perfect combustion is obtained.

The bridge 11, which is positioned in front of the tube plate and at a distance therefrom, is raised sufliciently high to form a target, as it were. against which the gases from the burner strike to be spread and deflected thereby. This bridge or target 11 is preferably raised to just below the three upper rows of tubes, and in order that the.

decrease in the normal draft area, caused by the placing of the bridge, as indicated,

for, the bridge is perforated by a plurality of openings 15, the total area of which is net less than the increase in area of the. bridge wall, and thus the necessary draft area for the ei'icient operation of the boiler is retained. The space 16 between the tube plate and the back of the bridge forms a combustion chamber which acts in a similar manner to the combustion chamber of a Scotch marine boiler.

It may be here stated that. ininarine boilers having tubular furnaces fitted with bridges as for coal, aswill be well understood by those skilled in the art, it is only necessary to increase the height of the existing bridge so that the gases from the burner will be intercepted thereby to impinge thereon, at the same time leaving openings tlierethrougli equal in area to the area taken up by the added portion of the bridge, thus maintaining the necessary area of draft passage past the bridge. The firebrick floor is laid on the grate bars in the manner similar to that already described with reference to the locomotive boiler partly showninFig. 1.

17 indicates my burner which is placed on the furnace front, preferably on the center line thereof and below and clear of the furnace door 8 so that, if nece s .iry to open the door at any time, it will swlng clear of the burner. The portion of the burner exterior of'the furnace is formed preferably uf conical shape, as shown at 18, in Fig. 2, from the inner periphery of which project into the center-a plurality of pin members 13), while the portion extending .into the furnace is tubular in formation, 20 in Fig. 2, the end of which portion is enlarged, as shown at :21 and closed, two slots 22 and 23 being cut in the closed end to allow for the exit of the A diaphragm plate ll divides the tubular portion 20 into two sections. The exterior mrtion of the burner is adapted for connection to any source of fuel supply and steam or compressed air for atomization puprposes, such as that indicated in Fig. 2, in which 25 represents the oil supply pipe connected to the nozzle 26 by the stop valve 2-7, and 28 represents the alternative steam or compressed air supply pipe enter ing the conical chamber lb on each side of the nozzle :26, steam being fed to the pipe 28 by the pipe 29 from the steam space of the boiler, and compressed air being fed by the pipe 30 from any suitable source and which pipe is open or closed by means of a suitable stop 'alve at any convenient point. A superheating .coil 31 is mounted on the inside of the door, the ends of which coil project outwardly through the door so that the steam pipe 29 may be detach-ably connected thereto by means of the union couplings 3'2 and 33 thus allowing for the dis connection of the steam pipe- 29 from the coil, and permitting the furnace door to be swung open at any time, should it be necessary to fire the boiler 'with coal. 1

The lnanner in which my invention operates will be apparent, on reference being made to the foregoing description and drawings, and may be described briefly as follows: The oil, entering the conical cham ber 18 through the nozzle 26, which is heated to a high temperature by means of the superheated steam, or compressed air, as the case may be, mixes with the steam or air and is forced along toward the tip of the burner, the mixture being broken up by the pin members 19. the diaphragm 24. and the restricted passages or slots 22 and through which it must pass into the furnace. The mixture being ignited at, the burner tip the burning gases impinge. against thebridge or target 11, at the same time mixing thor oughly with the air passing through the openings 12. 13 and 1%, and this'target be coming, in a short time heated to a white at the inner end of the said grate bars provided with a plurality of draft passages therethrough and adapted to intercept and receivagainst its face the gases discharged from the burner, and a floor covering the said grate bars and provided with a plurality of draft passages therethrough, the said passages being arranged longitudinally on each side of the center line of the burner, the passages nearest the burner being larger than those remote from the burner.

In an oil burning furnace having grate bars, a burner delivering into the urnace and a bridge set vertically adjacent the inner end of said grate bars. a floor covering said bars and provided with a plurality of draft passages therethrough. the said passages being arranged longitudinally on each side of the center line-of the burner, the passages nearest the burner .being larger than those remote fromthe burner. l

3. In an oil burning furnace having grate bars, a burner delivering into the furnace and a floor covering said bars provided with a plurality of draft passages therethrough, said passages being arranged longitudinally on each side of the center line of the burner, the passages nearest the burner being larger than those remote from the burner.

Dated at Vancouver, B. C., this 30th day of March 1915.

JOHN ROBERT BROVN.

Witnesses JAMES TAYLOR, ISOBEL D. ORR.

nace, a bridge set vertically and transverseliy 

